Mate I have only a small idea but it is CRAZY. At my middle and high school it ran rampant where entire friend groups were trans and even more were lgbtq+, even at my job with the 20+ year olds.  One time I watched one VIDEO, a trans timeline that was like 3-5 minutes long, and it was enough to make me question if I was trans for weeks. This ideology is like a drug to insecure teenagers, and especially girls as I'm a girl and can really only speak for girls, although I see it a ton in guys now too. 

I mean I'm not trying to generalize all of these people but a TON I knew as a teenager and in high school were just normal straight girls, maybe with an alternative fashion sense, a lot liked theatre and thus wanted to make a huge show and be "different." And like, I'm not saying it's a shallow thing because they are obviously very confused, but they buy into the ideology that your gender can be fluid and it's based on what you feel inside so if they like sports, then boom. They're a boy now. But since "gender is a social construct" they can identify as a boy but still be girly. A lot of these people are just very young and don't have fully developed brains yet, and hopefully they'll grow out of it before starting hormones.

I find it so hypocritical that the rainbow squad says they want everyone to be equal, feel accepted, and have a safe space while actively making fun of or belitting anyone who is cisgender and heterosexual. It's like the reverse of what they were fighting for in the beginning. For instance, I was always called gay as a preteen and teenager because I wasn't hyperfeminine and liked sports and superheroes more than makeup and boys. I identified as LGBT for five years and now whenever I tell people I'm straight they go "there's no waaay you are so giving sapphic" or "you atleast like  girls a LITTLE bit"

To respond to the first part of your comment, it being used to "explain" things is SO ACCURATE. It's so common too. Adolescence is so confusing, and labels help t(w)eens and young adults make sense of it all. And it stretches beyond trans to include mental illness labels, neurodivergence labels, and sexuality labels.

I frequently think about how if if grown up in the 80s like my mom I would've been just one tomboy in a whole crowd of tomboys, and that would've been normal. I wouldn't have been called gay at 11 or 12 years old and wouldn't have ever thought I was anything other than a girl and a straight girl at that. Now everything is so black and white- you're either sexualized at 15 or you're trans. 

I went through a "well if I can't transition, nobody can" phase a while back and would've been considered internally transphobic. Now, I don't really know how to feel about trans people. I don't want anybody to hurt themselves with experimental drugs or puberty blockers, and I also think transitioning pushes this narrative of "if I'm not a traditional girl/boy, I NEED to become the opposite sex to do/be the things I want."

A lot of ftms say T makes them happier, more satisfied, cry less, less suicidal, and they attribute that to meaning they're now in "the right body" when it's really just the hormones affect. I never took T but when I stopped identifying as trans and attributing all my issues to that, I had to face the fact that I really hated myself and felt ugly and immature, so maybe you're going through both. I have gotten less depressed through just getting up, going out, working, and talking to people. Doing stuff and focusing on other people really does miracles for depression. I hope you'll find a way to find happiness again, because a life without depending on medication or ideology is totally worth living.

Yes yes yes, all true! Especially that last part- being nerdy and having alternative fashion would've been completely normal twenty years ago, but now it's a "surefire sign you're queer" and even had me confused for a loooong time, thinking I must be gay because I'm "so different." Like no lol. I just don't like crop tops and Instagram. I didnt know having a personality that was not mainstream made me magically into girls or was comorbid with gender dysphoria. And the worst part is that it's even more extreme for the younger generations. I was just barely old enough to have the sense to get out of that cult. I'd do anything to tell young girls that they're just perfect how they are and don't need to change a thing.

As someone who identified as part of the LGBTQ+ community in some way or another since 13, I understand what OP is going through. It was as if I had to go through the coming-of-age most 13 year old girls go through at 18. I'm talking makeup, bras, actually building confidence to wearing a swimsuit after eight years, etc. 

I had very similar reasons for transitioning socially and identifying as nb/ftm as a teen. I was always a socially awkward tomboy who didn't fit in with other girls my age, was called a nerd all the time and called gay a lot, and so instead of addressing insecurity, I dressed like a boy for nearly all my teen years. It was almost easier to go through puberty that way than trying to be pretty and compete with the Kardashian wannabees in my old high school lol.